Did you check the folders above that they are empty?
Even if the test connection gives error click on ok.
Can you connect to the camera from the web browser?
What camera is it and how do you connect it (template, ONVIF, custom url)?
If custom url use VLC and see if it works.
Are the cameras on the same LAN as the NCS computer.
No extra spaces in user name and password?
Can you give me access to the computer with TeamViiewer?